I am sorry. (to apologize)

American Sign Language:
Sorry. http://commtechlab.msu.edu/sites/aslweb/S/W3760.htm

English:
I am sorry.

French:
Je suis désolée. (female)
Je suis desolé. (male)

Italian:
Mi dispiace.

Spanish:
Lo siento.

Swahili:
Samahani.